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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25cebac594d120f4f0b52c31d982c6f1da79f4554da25ac9e91b3f0e57c42f9' 
  AND token = '8mfGElW4kquFLVVBUhjNkEefwNmqlu4cqcj4mOala14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}